This step-by-step simulation concerns non-ideal mixing and partial molar quantities. The simulation randomly selects between entropy or enthalpy, and the user determines excess entropy or enthalpy, temperature change of mixing, and partial molar entropy or enthalpy. Directions for each step are given at the top of the plot. After completing each step, the user selects "show solution" to see the answer (green button above the plot). At any time, the user can select "new problem" to start over; it switches between entropy and enthalpy every time it starts over. The properties of components A and B (pure-component enthalpy/entropy, deviation from ideal behavior, etc.) are randomized every time "new problem" is selected.

This simulation was created in the Department of Chemical and Biological Engineering, at University of Colorado Boulder for LearnChemE.com by Neil Hendren under the direction of Professor John L. Falconer. This simulation was prepared with financial support from the National Science Foundation. Address any questions or comments to learncheme@gmail.com.

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